fix(styling): styling issue in Firefox after col reordering, fixes #297

[ghiscoding]

• found a commit in SlickGrid to address Firefox styling issue 6pac/SlickGrid@a8d4452

BEFORE

AFTER

[codecov-io]

Codecov Report

Merging #300 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #300   +/-   ##
=======================================
  Coverage   96.33%   96.33%           
=======================================
  Files         134      134           
  Lines        7538     7538           
  Branches     2569     2569           
=======================================
  Hits         7261     7261           
  Misses        277      277

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